Dropping-stopper for medicine-bottles



(No Model.)

W. W. & E. F. PRESTON.

DROPPING STOPPER POR-MEDIQINE BOTTLES. No. 412,788. Patented Oct. 15, 1889.

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UNITED STATES PATENT OFFICE.

IVILLIAM IV. PRESTON AND EDlVARD F. PRESTON, OF BISMARCK, MICHI- GAN, ASSIGNORS TO THE PRESTON ICE OREEPER COMPANY, OF CHICAGO, ILLINOIS.

DROPPiNG STOPPER FOR M EDECIN E=BOTTLES.

SPECIFICATION forming part or" Letters Patent No. 412,788, dated October 15, 1889.

Application filed December 3, 1888. Serial No. 292,578. @2210181.)

To all whom it may concern: the opening 72, and at this time some liquid Be itknown that we, IVILLIAM IV. PRESTON may also enter through the opening g, so and -EDVVARD F. PRESTON, citizens of the that the tube is filled. hen the tube is United States, residing at Bismarck, in the filled and the air displaced from it by the v county of Eaton and State of Michigan, have liquid, other air begins to enter at the eXteinvented a new and useful Improvement in rior port g and pass in bubbles along the up- Dropping-Stoppers for Medicine-Bottles, of per side of the tube, escaping into the bottle which the following is a specification. through the aperture g and the liquid be- This invention relates to a dropping-tube gins to discharge in regular drops from the IO for bottles applicable to any ordinary bottle nozzle f. The passage ofthese bubbles of air and contrived of a single glass tube, so that is visible through the sides of the transparent the operation of the liquid within the same tube and transparent bottle, and the operis visible, the glass tube being so constructed ator can count the drops and regulate his opthat it can be inserted through any ordinary erations accordingly. The inner end of the 15 cork and covered with a cap when not in use. tube beyond the opening gf and at the part In the accompanying drawings, which form marked c forms an airoha1nber, where a pora part of the specification, and in which simition of the air always collects and remains lar letters of reference indicate like parts, during the operation of dropping. This por- Figure l is a sectional view of a bottle protion of air thus confined in the tube, when 20 vided with my improved dropping apparathe bottle is turned down into position for tus, the whole being shown in section and in dropping, forms a cushion to receive the enthe act of dropping. Fig. 2 is a View of the tering bubble of air, and prevents the liquid glass dropping-tube upon a somewhat larger from flowing into the air-aperture g to interscale. Fig. 3 shows the perforated cork, and fere with the regularity of the dropping.

Fig. at the cap for covering the tube. v hen the dropping is finished, it is stopped In the drawings, A represents a common by simply reversing the position of the botmedicine-bottle partly filled with the liquid, tle, and then, to prevent evaporation, the cap as at B. M will be placed over the tube, inclosing it C is the glass tube having a single bore or from the air.

3o passage. The end which is inserted in the The construction of ourimproveddroppingbottle is closed entirely, as at e. The outer tube is so simple, requiring no partitions, end is drawn together to form a fine disvalves, or double tubes, that it can be readily charge opening, (indicated at f.) Air-holes made of glass, and thus rendered transparent, are provided for inlet of air at g at a point so that the whole operation of dropping is 35 outside of the bottle and near the cork, and visible to the operator, and he is able more at g for exit from the tube into the bottle. readily to govern the same. Moreover, this The port for the admission of the liquid to material is less liable to corrosion, is more the dropping-tube is located in said tube at cleanly, and easily cleaned.

a point within the bottle, as at It, and nearer It has also been our intention in this inven- 40 to the cork than the opening 9 and oppositely tion to devise a dropper which could be used located on the tube. only as such, and which necessarily delivers The stopper or cork, which may be made the fluid in drops instead of a stream, as this of cork or rubber or other suitable material, peculiarity enables the use of the device with is shown at J, and is perforated for the paslittle care and by persons lacking the steadi- 4 5 sage of the tube. A suitable cap for coverness of hand required in dropping from a 5 ing the nozzle of the stopper when not in use large opening or tube. To this end the drop.- is shown at M. ping-aperture at the point is made so minute The operation is as follows: "When the botas to give slow emission to the fluid. tle is tipped into the position. shown. at Fig. Our dropper is, we believe, the first in which 50 1, the liquid flows down into the tube through a single-bore dropping-tube of such small diameter as to insure its being entirely filled with the liquid when the bottle is tipped has been used as a passage for both the air and the fluid.

We claim The combination, with a medicine-bottle and its stopper, of a Chopping-tube passing through the cork and constructed With a single bore, said tube having a dropping-aper- 10 ture at its outer point and air-inlet port back of its point but outside the cork, a fluidinlet- Within the bottle, and; an air-outlet near its extreme inner end, such inner end being closed, substantially as set forth.

WILLIAM W. PRESTON. EDWARD F. PRESTON. VVitnessesz' H. M. MUNDAY, J OHN W. MUNDAY. 

